I already have one marked Butterfly deck, and the only way to get an unmarked version seems to be the Treasure set, which comes with 2 marked and 2 unmarked decks. However, the set is a bit pricey at $100..... Has anyone bought one of these sets, and what do you think about it?

I don't have this particular set, but I was an original backer on Indigogo. The "unmarked" decks are not unmarked, unfortunately. They are simply differently marked (instead of two marking systems, they are down to one, pretty much.) They are good cards, don't get me wrong, but at least with the original release, there were no truly unmarked decks.